To assess the biological function of ATM in endometrial cancer cells, we utilized KU-55933, a specific inhibitor of ATM, to interfere with its expression. The sensitivity to KU-55933 of these six cell lines was examined by CCK8 assay to determine the dose for combination treatment (Figure S4)....These results demonstrate that Olaparib in combination with KU-55933 may be an effective treatment means for endometrial cancer with high-level ATM.